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Major League Baseball's competition committee is considering an adjustment to the pitch clock when runners are on base, according to ESPN's Jeff Passan. The proposed change would leave pitchers with 18 seconds between pitches whenever someone is on base, a reduction of two seconds and a push closer to the 15 seconds pitchers are afforded between pitches with the bases empty.

Per Passan, the motivation is to "reverse a late-season trend that saw the average time of game increase." As part of the proposal, teams would also have their mound visits reduced from five to four per game. 

The Athletic's Ken Rosenthal notes that a slew of other changes have been proposed. Most of them relate to umpires resetting the clock following a timeout, or pitchers not being allowed to buy extra time by stalking around the mound. Two other possible tweaks: pitchers being forced to work from the stretch with a runner on base, and any pitcher who warms up on the mound having to face at least one batter. It's unclear if that includes pitchers who suffer injuries during their warm-up throws, but Rosenthal notes that it's aimed at eliminating "the ability for the defense to wait for the first hitter of the inning to be announced and then make a pitching change."

The competition committee is formed by six members from teams, four players, and an umpire. The players are said to be "discussing the proposal and expect to go back to the committee with suggestions on potential adjustments."

Baseball Reference's data shows that the average game did grow longer as the season burned on. As you can see below, the first full month of the season saw games take on average two hours and 36 minutes. The last full month saw games last an additional eight minutes. 

MonthAverage time of game

April

2 hours, 36 minutes

May

2 hours, 37 minutes

June

2 hours, 39 minutes

July

2 hours, 40 minutes

August

2 hours, 41 minutes

September

2 hours, 44 minutes

It's worth noting that September's time of game still represented an appreciable reduction from the 2022 average game, which lasted more than three hours. Indeed, September's average time of game would've represented the shortest mark since at least 1998, again per Baseball Reference's data

The 2023 season marked the first time MLB had used the pitch clock. Clearly, it may not be the last time that the league discusses tweaks to the mechanism.